Carbonyl chemistry question

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Type of reaction for A = _______ 

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Reagent used in A = _______ 

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Product name in A = _______ 

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Name of reaction B = _______ 

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Observation for reaction B = _______ precipitate.

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B) This is used to test for a methyl group next to a C=O.

Note the false positive notes given as hints below.

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Give the formulae for the two products made in raction B?_______  _______ 

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Type of mechanism for C = _______ _______ 

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This reaction (C) is useful in synthesis as it makes the carbon chain _______ by _______ 

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The organic product of Reaction C is a racemic mixture.  State the meaning of ‘racemic mixture’.

A mixture containing _______  amounts of (the two) _______  / optical isomers

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By referring to the mechanism of Reaction C, explain why a racemic mixture forms in this reaction.

The _______  group / carbonyl group / reaction site is _______ 
So CN‒ can attack (equally) from above or _______  

B) This is used to test for a methyl group next to a C=O.Note the false positive notes given as hints below.

B) This is used to test for a methyl group next to a C=O.

Note the false positive notes given as hints below.